[c-nsp] ASR9k CWDM Optics

[Mikael Abrahamsson]

On Mon, 17 Oct 2011, Mark Tinka wrote:

> The issue becomes worse if you don't own the infrastructure, as I'm yet 
> to find a telco willing to bill you for an alien wavelength model.

I can understand this, as from what I've seen, some DWDM systems will do 
bad things if you for instance mix up RX and TX (sending light backwards 
into the EDFA is not considered a normal operating case).

You also have the case where coherent detection and NRZ don't like to be 
adjacent channels. Quality management is also hard... So in these cases 
where different administrative entities need to interoperatre, 
transponders give a nice handoff that is well specified.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se